Three Vectors Synthesis Model Predictive Fluxs Control for Open-Winding Induction Motor

When the method of conventional model prediction flux control is used in the field of the open-winding induction motor in common DC bus type, due to the zero-sequence current suppression and fixed the magnitude and angle of the vectors, quantity of spatial voltage vectors applied is limited. That results in torque pulsations and speed fluctuations of the motor. Aiming at this problem, a three vectors model predictive flux control strategy with deadbeat of torque and flux is proposed. According to the control strategy, an optimal voltage vector of zero error in angle and amplitude is obtained. Together with zero vector, two effective voltage vectors, which can be synthesized the optimal voltage vector in control cycle, are explored to find from six space vectors without effect of common mode voltage. The three vectors are the input control of the converter in order that the accuracy of the dual inverter’s spatial voltage vector is improved. Simulated and experimental results show that the motor’s torque pulsation, speed fluctuation and stator current harmonic are reduced effectively by this control strategy.